It seems the download page of Log4Net or all of Logging is affected by the attacks and changes;-| However, its Git repo (GitHub mirror here) especially all examples are built and made available as VS projects, too: https://github.com/apache/log4net/tree/trunk/src/examples/cpp At least while they still used SVN everything was based on VS files: https://svn.apache.org/repos/asf/logging/log4net/trunk/src/log4net/ Slight variations of the (mostly Java or C based) default build and release chain similar to Log4Net seems necessary here.
If the GitHub mirror passes everthing through from the Apache Git server, then it seems Log4Net always had just a single active committer for the last 10 years;-)